Possible brand of some DX lasers

PowerMaster - http://www.vavolo.com/Func_info.asp,Func_ID,39,Func_Name,PowerMaster+Laser+Pointers,,.htm

Some look familiar, especially DX's new 473nm models, and the green oddly-shaped, chrome pointer.

No... the lasers DX sells are primarily made by either Spymodex or Newwish - the few exceptions being some of the keychain pointers and the 200mW red. These "powermaster" folks don't make these any more than DX does.